It seems to be a little tricky on the adobe page. Following the recommended download links (chrome is explicitly mentioned) you get only the NPAPI version. To download the PPAPI version via FlashUtil64_21_0_0_197_pepper.exe and not via FlashUtil64_21_0_0_197_Plugin.exe I needed to choose specifically a version for a different computer. Only there I got the correct version for my Vivaldi 1.0.435.26 (Developer Build) (64-bit) on Windows 10.
[attachment=2975]20160401PPAPI.JPG[/attachment]
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